1Control Range: 7 band sound equalizer control range of 12dB. Equalization bands are 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz, composed of TI or ST TL07 2Basic Parameters: 7 band digital equalizer preamplifier gain, 4580 classic operational amplifier provides 5 times the amplification 14dB; input impedance of 20K, output impedance of 600. 3Compatible: Dual channel digital equalizer ear amplifier part is composed of NE5532 type 47 headphone driver circuit, easy to drive a variety of types of headphones, adjustable high and low. 45mm Interface: Car digital equalizer is 5mm input interface supports 4 pole plug, the output is connected to a headset with microphone, which can be used for normal voice calls on cell phones, and the other terminal has a group connection port available. 5Aluminum Alloy Material: Graphic car sound equalizer is made of premium aluminum alloy, high strength, corrosion resistance, stable performance, DC5V12V power supply, dual channel sound.